<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="../node_modules/react/umd/react.development.js"></script>
<script src="../node_modules/react-dom/umd/react-dom.development.js"></script>
<script src="../node_modules/babel-standalone/babel.js"></script>
</head>
<body>
<div id="app">
</div>
<script type="text/babel">
let arr = [1,2,3,4];
// 根组件默认拿到全局变量为data的值 在子组件传值直接传值进行调用
class List3 extends React.Component{//必须是大写的首字母
render(){
console.log(this);//符号必须是分号不能是逗号
return(
this.props.data.map((item,index)=>{
return (
<div key={index}>{item}</div>
)
}
)
)
}
}
function List(arr) {
return (
<ul>
{
arr.map((item,index)=>{
return <li key={index}>{item}</li>
})
}
</ul>
)
}
function List2(arr) {
return (
<ul>
{
arr.data.map((item,index)=>{
return <li key={index}>{item}</li>
})
}
</ul>
)
}
ReactDOM.render(
<div>
{List(arr)}
<List2 data={arr} />
<List3 data={arr}/>
</div>,
document.getElementById('app')
)
</script>
</body>
</html>